1. WJEC A2 Geology
BGS Mapwork Exercises
I.G.Kenyon

2. The Geology of Hadrian’s Wall
Quartz Dolerite
Describe the strike and dip of the rocks shown on the map extract
Outline, using map evidence the likely form of the quartz dolerite intrusion

3. The Geology of Wenlock Edge, ShropshireX 9 N 10
Silurian Rocks Y
Describe the strike and dip of the beds shown on the extract above

4. Geology and Topography of Wenlock Edge, ShropshireX Y
Aymestry Limestone
Periglacial Head
Boulder Clay
Upper Ludlow Shales
LowerLudlow Shales
Wenlock Limestone
Cross section along line X-Y from the map on the previous slide
Using the geology map on the previous slide and the cross section above, outline the relationship between lithology and topography

5. Clitheroe 1:50,000 Sheet 68 Solid & Drift
Describe the strike and dip of the beds in this box
Suggest reasons to explain the V-shaped outcrop pattern here

6. Ayr 1:50,000 Sheet 14(W) Solid
Describe the likely form of the igneous intrusion here
This fault dips South West, identify the type of fault
Describe and identify the fold structure within this box

7. Exeter 1 inch : 1 mile Sheet 325 Solid & Drift
Carboniferous grits and shales N
Basic igneous rocks
Using this slide and the next, try to identify the types of igneous features
Permo-Triassic breccias and conglomerates

8. Exeter 1 inch : 1 mile Sheet 325 Solid & Drift
Identify the types of igneous features
Dolerite (D)
Perm-Triassic breccias and conglomerates
Carboniferous grits and shales
Basalt(B)
Tuffs
Section along southern margin of the map of previous slide

9. Hexham 1 inch :1 mile Sheet 19 Solid
Identify the main fold structure in the yellow box, refer to dip and strike values, symmetry and plunge where appropriate

10. Okehampton 1 inch : 1mile Sheet 324 Solid & Drift
Describe the outcrop pattern of igneous rock D and identify the type of intrusion
Line of cross section on next slide
Granite
Estimate the width of the metamorphic aureole around the granite above

11. Okehampton 1 inch : 1mile Sheet 324 Solid & Drift
Describe the fold structure between A and B on the cross section below A B
What map evidence is there to confirm that this part of the bed is overturned? How could you confirm this in the field?

12. LLandrindod Wells 1:25,000 Sheet 15/16 Solid
Describe the map evidence to suggest there is a plunging syncline and anticline on the extract above. In which direction are the folds plunging?

13. This fault plane dips East at 76° Identify the fault type
LLandrindod Wells 1:25,000 Sheet 15/16 Solid N
This fault plane dips East at 76° Identify the fault type

14. This fault dips SSE at 70° Identify the type of fault
Harlech 1:50,000 Sheet 135 Solid
This fault dips SSE at 70° Identify the type of fault C D
Describe and identify the major fold structure along line C – D. Refer to strike and dip, symmetry and plunge where appropriate

15. What happens to the conglomerate here?
Wrexham 1:50,000 Sheet 121 Solid
Compare and contrast the strike and dip values of the Silurian (b) and Carboniferous (d) Beds
What happens to the conglomerate here?
This bed is a basal conglomerate, explain the significance of this with respect to the junction between the Silurian and Carboniferous beds
Carboniferous
Silurian

16. Brough-under-Stainmore 1:50,000 Sheet 31 Solid
Using map evidence, describe and explain the outcrop of the Carboniferous beds in the NE corner of the extract F
The Hilton Fault dips SW at 80° Identify the fault type E

17. Brough-under-Stainmore 1:50,000 Sheet 31 SolidF d E
b = Ordovician d = Carboniferous e = Permian f = Triassic
Describe and identify the major geological structures shown on the cross section above

18. Lake District 1:250,000 Sheet 54°N - 04° West Solid
Permian
Ordovician
Carboniferous
Describe the likely nature of these igneous intrusions
Identify 2 unconformities on the map extract
Silurian

19. Lake District 1:250,000 Sheet 54°N - 04° West Solid
Carboniferous
Silurian
Permian
Ordovician
Shap Granite
Ordovician
Identify 2 unconformities on the cross section above, use information from the previous slide to help you

20. Monmouth 1:50,000 Sheet 233 Solid & DriftB A D
Note-basal conglomerate G H
Describe and identify the major fold structure along line G – H on the map extract C
Identify the structures shown in boxes A, B, C and D

21. The Roaches & Upper Dove Valley 1:25,000 Sheet SK06 Solid & Drift
Identify the major fold structure in the box above, refer to strike, dip, symmetry and plunge where appropriate

22. The Roaches & Upper Dove Valley 1:25,000 Sheet SK06 Solid & Drift
Landslide
Oldest bed
Describe and identify the major fold structure on the extract above, refer to strike, dip, symmetry and plunge where appropriate. Outline the likely reason for the occurrence of the large landslide on the map

23. Church Stretton 1:50,000 Sheet 166 Solid
Describe the major fold structure in the highlighted box, refer to strike, dip, symmetry and plunge where appropriate
Dolerite
Suggest, with reasons the likely form of the dolerite intrusion on the extract

24. Miller’s Dale 1:25,000 Sheet 17 Solid & Drift
Describe and identify the major fold structure on the extract above, refer to strike, dip, symmetry and plunge where appropriate

25. Bristol 1 inch:1mile Solid & Drift
Describe the relationship between beds f6 and d2 on the map extract
Identify the major fold structure in the box on the map extract above

26. Bristol 1 inch:1mile Solid & Drift
Describe and identify the major fold structure in this area of the map extract

27. Bristol 1 inch:1mile Solid & Drift
Describe and explain the nature of the faulting in this area
Describe the relationship between the f6 Triassic beds and the Carboniferous d1 to d3 beds on the extract
Identify the major fold structure in this area

28. Pembroke & Linney Head 1:50,000 Sheets 244/245 Solid & Drift
Describe and identify the major fold structures along line P – Q Check your answer on the next slide Q

29. Pembroke & Linney Head 1:50,000 Sheets 244/245 Solid & Drift
Describe the major fold structures on the cross section above. Suggest areas where beds are likely to be overturned. What field evidence could you look for to prove some limbs were inverted?

30. Pembroke & Linney Head 1:50,000 Sheets 244/245 Solid & Drift
Identify and describe 2 major fold structures on the map extract, refer to strike, dip, symmetry and plunge where appropriate

31. Maidstone 1 inch:1 mile Sheet 288 Solid & DriftJ
Line of section on next slide N
This fault plane dips S at 77° State the type of fault
Check your answer on the next slide K

32. Maidstone 1 inch:1 mile Sheet 288 Solid & Drift
How could you calculate the throw of the fault?
North
South
Reverse Fault K J
Hanging wall upthrown
Footwall downthrown

33. Lands End 1:250,000 Sheet 50N 06W Solid
Describe and account for the shape of the metamorphic aureole around the St. Austell granite
St.Austell Granite
Edge of metamorphic aureole

34. Maidstone 1 inch : 1 mile Sheet 288 Solid & Drift
Describe the drainage pattern shown in the North and Eastern part of the map
Maidstone 1 inch : 1 mile Sheet 288 Solid & Drift

35. This fault plane dips WNW at 67°, state the type of fault
Swansea 1:50,000 Solid Sheet 247
This fault plane dips WNW at 67°, state the type of fault
Identify the main fold structure, refer to dip and strike, symmetry and plunge where appropriate N

36. Swansea 1:50,000 Solid Sheet 247 X Y Identify this fault structure
The Grovesend Fault dips East at 40°
This fault dips west at 47°
Identify this fault structure
Identify the structure between these 2 faults X

37. Swansea 1:50,000 Solid Sheet 247
Describe the major fault structures on the cross section below
Cross section along line X-Y on previous slide

38. Coventry 1:50,000 Solid & Drift Sheet 169A
Describe the strike and dip of the coal seams in boxes A and B
Account for the variation in outcrop pattern of the coal seams in boxes A and B on the map extract B

39. Coventry 1:50,000, Solid & Drift Sheet 169A
Describe the map evidence to support the idea there is an angular unconformity within highlighted box A on the extract above

40. Newton Abbot 1:50,000, Solid & Drift Sheet 339
Granite
Describe and account for the drainage pattern developed on the granite on the western side of the map extract

41. Newton Abbot 1:50,000, Solid & Drift Sheet 339
Dolerite
What type of intrusion is represented by the dolerite?
Granite
m = metamorphic aureole
Give 2 pieces of map evidence to show that the granite intrusion is younger than the dolerite on the extract above

42. Newton Abbot 1:50,000, Solid & Drift Sheet 339
Dolerite 75 A
Black Shales
A major quarry is located in box A above. Outline 2 problems that the local geology may present to the quarrying activity.

43. Newton Abbot 1:50,000, Solid & Drift Sheet 339
State the map evidence for these beds being horizontal
Impermeable Breccia
Landslip
Permeable Sandstone
Periglacial Head Gravel-Permeable
Outline the factors that may explain the formation of the landslip shown on the extract above

44. The End